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Related Experiment Videos

Two visual corticotectal systems in cat.

K Ogasawara, J G McHaffie, B E Stein

    Journal of Neurophysiology
    |December 1, 1984
    PubMed
    Summary
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    Two visual pathways project to the superior colliculus (SC): one from visual area 17-18 to superficial SC cells, and another from the posterior suprasylvian cortex (PSSC) to deep SC cells.

    Area of Science:

    • Neuroscience
    • Visual Processing
    • Cortical Function

    Background:

    • The superior colliculus (SC) plays a crucial role in visual processing and sensorimotor integration.
    • Understanding the origins and functions of visual projections to the SC is essential for deciphering visual pathways.

    Purpose of the Study:

    • To investigate the functional segregation of visual projections to the superior colliculus (SC).
    • To determine the specific roles of area 17-18 and posterior suprasylvian cortex (PSSC) projections in SC cell activity.

    Main Methods:

    • Cortical cooling was employed to selectively deactivate specific cortical regions (area 17-18 and PSSC).
    • The effects of deactivation on the activity and receptive-field properties of SC cells (superficial and deep lamina) were analyzed.

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    Main Results:

    • Deactivation of area 17-18 impaired superficial SC cells, affecting directional selectivity, binocularity, and spatial summation.
    • Deactivation of PSSC similarly affected deep SC cells, mirroring the effects on superficial cells.
    • Both pathways are critical for maintaining SC cell excitability and receptive-field complexity, with minimal overlap.

    Conclusions:

    • Two distinct visual corticotectal systems exist: one from area 17-18 to superficial SC cells, and another from PSSC to deep SC cells.
    • These systems are largely independent and crucial for the functional properties of SC neurons.
    • Evidence suggests a tonic inhibitory influence from these pathways on SC cells.